//CvvImage.cpp

#include "pch.h"
#include "CvvImage.h"

// Construction/Destruction

CV_INLINE RECT NormalizeRect( RECT r );
CV_INLINE RECT NormalizeRect( RECT r ) {
    int t;

    if( r.left > r.right ){
        t = r.left;
        r.left = r.right;
        r.right = t;
    }

    if( r.top > r.bottom ) {
        t = r.top;
        r.top = r.bottom;
        r.bottom = t;
    }

    return r;
}

CV_INLINE CvRect RectToCvRect( RECT sr );
CV_INLINE CvRect RectToCvRect( RECT sr ) {
    sr = NormalizeRect( sr );
    return cvRect( sr.left, sr.top, sr.right - sr.left, sr.bottom - sr.top );
}

CV_INLINE RECT CvRectToRect( CvRect sr );
CV_INLINE RECT CvRectToRect( CvRect sr ) {
    RECT dr;
    dr.left = sr.x;
    dr.top = sr.y;
    dr.right = sr.x + sr.width;
    dr.bottom = sr.y + sr.height;

    return dr;
}

CV_INLINE IplROI RectToROI( RECT r );
CV_INLINE IplROI RectToROI( RECT r ) {
    IplROI roi;
    r = NormalizeRect( r );
    roi.xOffset = r.left;
    roi.yOffset = r.top;
    roi.width = r.right - r.left;
    roi.height = r.bottom - r.top;
    roi.coi = 0;

    return roi;
}

void  FillBitmapInfo( BITMAPINFO* bmi, int width, int height, int bpp, int origin ) {
    assert( bmi && width >= 0 && height >= 0 && (bpp == 8 || bpp == 24 || bpp == 32));

    BITMAPINFOHEADER* bmih = &(bmi->bmiHeader);

    memset( bmih, 0, sizeof(*bmih));
    bmih->biSize = sizeof(BITMAPINFOHEADER);
    bmih->biWidth = width;
    bmih->biHeight = origin ? abs(height) : -abs(height);
    bmih->biPlanes = 1;
    bmih->biBitCount = (unsigned short)bpp;
    bmih->biCompression = BI_RGB;

    if( bpp == 8 ) {
        RGBQUAD* palette = bmi->bmiColors;
        int i;
        for( i = 0; i < 256; i++ ) {
            palette[i].rgbBlue = palette[i].rgbGreen = palette[i].rgbRed = (BYTE)i;
            palette[i].rgbReserved = 0;
        }
    }
}

CvvImage::CvvImage() { m_img = 0; }

void CvvImage::Destroy() { cvReleaseImage( &m_img ); }

CvvImage::~CvvImage() {  Destroy(); }

bool  CvvImage::Create( int w, int h, int bpp, int origin ) {
    const unsigned max_img_size = 10000;

    if( (bpp != 8 && bpp != 24 && bpp != 32) || (unsigned)w >=  max_img_size || (unsigned)h >= max_img_size ||
        (origin != IPL_ORIGIN_TL && origin != IPL_ORIGIN_BL)) {
            assert(0); // most probably, it is a programming error
            return false;
    }

    if( !m_img || Bpp() != bpp || m_img->width != w || m_img->height != h ) {
        if( m_img && m_img->nSize == sizeof(IplImage))
            Destroy();

        m_img = cvCreateImage( cvSize( w, h ), IPL_DEPTH_8U, bpp/8 );
    }

    if( m_img )
        m_img->origin = origin == 0 ? IPL_ORIGIN_TL : IPL_ORIGIN_BL;

    return m_img != 0;
}

void  CvvImage::CopyOf( CvvImage& image, int desired_color ) {
    IplImage* img = image.GetImage();
    if( img )  {
        CopyOf( img, desired_color );
    }
}

#define HG_IS_IMAGE(img)                                                  \
    ((img) != 0 && ((const IplImage*)(img))->nSize == sizeof(IplImage) && \
    ((IplImage*)img)->imageData != 0)

void  CvvImage::CopyOf( IplImage* img, int desired_color ){
    if( HG_IS_IMAGE(img) )   {
        int color = desired_color;
        CvSize size = cvGetSize( img );

        if( color < 0 )
            color = img->nChannels > 1;

        if( Create( size.width, size.height, (!color ? 1 : img->nChannels > 1 ? img->nChannels : 3)*8,  img->origin )) {
            cvConvertImage( img, m_img, 0 );
        }
    }
}

bool  CvvImage::Load( const char* filename, int desired_color ){
    IplImage* img = cvLoadImage( filename, desired_color );
    if( !img )  return false;

    CopyOf( img, desired_color );
    cvReleaseImage( &img );

    return true;
}

bool  CvvImage::LoadRect( const char* filename, int desired_color, CvRect r ){
    if( r.width < 0 || r.height < 0 ) return false;

    IplImage* img = cvLoadImage( filename, desired_color );
    if( !img )      return false;

    if( r.width == 0 || r.height == 0 )   {
        r.width = img->width;
        r.height = img->height;
        r.x = r.y = 0;
    }

    if( r.x > img->width || r.y > img->height ||  r.x + r.width < 0 || r.y + r.height < 0 )   {
        cvReleaseImage( &img );
        return false;
    }

    if( r.x < 0 )   {
        r.width += r.x;
        r.x = 0;
    }
    if( r.y < 0 )   {
        r.height += r.y;
        r.y = 0;
    }

    if( r.x + r.width > img->width )     r.width = img->width - r.x;

    if( r.y + r.height > img->height )      r.height = img->height - r.y;

    cvSetImageROI( img, r );
    CopyOf( img, desired_color );

    cvReleaseImage( &img );
    return true;
}

bool  CvvImage::Save( const char* filename ){
    if( !m_img )      return false;
    cvSaveImage( filename, m_img );
    return true;
}

void  CvvImage::Show( const char* window ){
    if( m_img )      cvShowImage( window, m_img );
}


void  CvvImage::Show( HDC dc, int x, int y, int w, int h, int from_x, int from_y ){
    if( m_img && m_img->depth == IPL_DEPTH_8U )   {
        uchar buffer[sizeof(BITMAPINFOHEADER) + 1024];
        BITMAPINFO* bmi = (BITMAPINFO*)buffer;
        int bmp_w = m_img->width, bmp_h = m_img->height;

        FillBitmapInfo( bmi, bmp_w, bmp_h, Bpp(), m_img->origin );

        from_x = MIN( MAX( from_x, 0 ), bmp_w - 1 );
        from_y = MIN( MAX( from_y, 0 ), bmp_h - 1 );

        int sw = MAX( MIN( bmp_w - from_x, w ), 0 );
        int sh = MAX( MIN( bmp_h - from_y, h ), 0 );

        SetDIBitsToDevice(
            dc, x, y, sw, sh, from_x, from_y, from_y, sh,
            m_img->imageData + from_y*m_img->widthStep,
            bmi, DIB_RGB_COLORS );
    }
}

void  CvvImage::DrawToHDC( HDC hDCDst, RECT* pDstRect ){
    if( pDstRect && m_img && m_img->depth == IPL_DEPTH_8U && m_img->imageData )   {
        uchar buffer[sizeof(BITMAPINFOHEADER) + 1024];
        BITMAPINFO* bmi = (BITMAPINFO*)buffer;
        int bmp_w = m_img->width, bmp_h = m_img->height;

        CvRect roi = cvGetImageROI( m_img );
        CvRect dst = RectToCvRect( *pDstRect );

        if( roi.width == dst.width && roi.height == dst.height )     {
            Show( hDCDst, dst.x, dst.y, dst.width, dst.height, roi.x, roi.y );
            return;
        }

        if( roi.width > dst.width )     {
            SetStretchBltMode( hDCDst,   HALFTONE );  // handle to device context

        }
        else     {
            SetStretchBltMode(hDCDst,  COLORONCOLOR );
        }

        FillBitmapInfo( bmi, bmp_w, bmp_h, Bpp(), m_img->origin );

        ::StretchDIBits(
            hDCDst,
            dst.x, dst.y, dst.width, dst.height,
            roi.x, roi.y, roi.width, roi.height,
            m_img->imageData, bmi, DIB_RGB_COLORS, SRCCOPY );
    }
}

void  CvvImage::Fill( int color ){
    cvSet( m_img, cvScalar(color&255,(color>>8)&255,(color>>16)&255,(color>>24)&255) );
}